To all anti capitalists here, how do you justify partaking in capitalism

So my question is to all anti capitalists here, how do you support partaking in capitalism and supporting a system that you are against....

And let me try to get more to the point. Suppose you say there is no other alternative and we have to live etc etc

Then why but expensuve smart phones and luxury items that you don't really need to live. Like you can easily live with a more basic phone and less capitalistic stuff. How do you justify supporting capitalism beyond your basic needs and especially on things that you can easily avoid, all knowing that you buying those stuff is basically supporting that system...

For example i am anti racist and I won't buy from a store that supports racism of any kind. And if I had to pay more, I will buy rather chose a place that aligns with my principles.